Issue link Parent / child

Issue with Parent/Child links across the different maps.
Suivi does not properly handle links when multiple connections need to follow the same trajectory.
If several links follow the same vertical path from one phase to another, the last one is not created.

Additional issue:
When a parent‑child link is added on the parent, the child should automatically be set as “Child of…”.
This is not happening: the parent correctly stores its child, but the child does not store its parent — and the same issue occurs in reverse when the configuration is set from the child.